Assets - Available-For-Sale Securities (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Total available-for-sale securities
Amortized Cost	$ 114,533		$ 104,512
Gross Unrealized Losses	(1,374)		(331)
Estimated Fair Value	113,159		104,181
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	105,906		103,182
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(1,297)		(331)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	5,367		0
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(77)
Contractual maturities - Amortized Cost
Amortized Cost, Due in one year or less	102,309
Amortized Cost, Due after one year through two years	12,224
Amortized Cost	114,533		104,512
Contractual maturities - Estimated Fair Value
Estimated Fair Value, Due in one year or less	101,262
Estimated Fair Value, Due after one year through two years	11,897
Available-for-sale Securities, Debt Securities, Total	113,159		104,181
Realized gains or losses
Realized gains or losses	0	$ 0
U.S. treasuries
Total available-for-sale securities
Amortized Cost	57,697		51,269
Gross Unrealized Losses	(689)		(174)
Estimated Fair Value	57,008		51,095
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	57,008		51,095
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(689)		(174)
Contractual maturities - Amortized Cost
Amortized Cost	57,697		51,269
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	57,008		51,095
Government agency securities
Total available-for-sale securities
Amortized Cost	15,291		12,075
Gross Unrealized Losses	(108)		(23)
Estimated Fair Value	15,183		12,052
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	12,585		12,052
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(100)		(23)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	2,598
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(8)
Contractual maturities - Amortized Cost
Amortized Cost	15,291		12,075
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	15,183		12,052
Corporate debt
Total available-for-sale securities
Amortized Cost	39,659		40,169
Gross Unrealized Losses	(577)		(134)
Estimated Fair Value	39,082		40,035
Available-for-sale securities in a loss position
Investments, Continuous loss position for less than 12 months, Estimated Fair Value	36,313		40,035
Investments, Continuous loss position for less than 12 months, Gross Unrealized Losses	(508)		(134)
Investments, Continuous loss position for 12 months or more, Estimated Fair Value	2,769
Investments, Continuous loss position for 12 months or more, Gross Unrealized Losses	(69)
Contractual maturities - Amortized Cost
Amortized Cost	39,659		40,169
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	39,082		40,035
Commercial paper
Total available-for-sale securities
Amortized Cost	1,886		999
Estimated Fair Value	1,886		999
Contractual maturities - Amortized Cost
Amortized Cost	1,886		999
Contractual maturities - Estimated Fair Value
Available-for-sale Securities, Debt Securities, Total	$ 1,886		$ 999